Well-travelled waterproof (kinda) Altura bar bag. I also have the klikfix fittings for different handlebar diameters (but you'll have to look up the fitting instructions online) and a shoulder strap for off the bike. It's 26cm wide x 20cm high x 17cm deep.
(also has velcro for attaching a map case that's long gone - as it predates Garmin and maps in your phone!)
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Old skool Altura dryline bar bag (Stockbridge, Edinburgh EH3)
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